HP 24S Uživatelská příručka Strana 75

  • Stažení
  • Přidat do mých příruček
  • Tisk
  • Strana
    / 102
  • Tabulka s obsahem
  • ŘEŠENÍ PROBLÉMŮ
  • KNIHY
  • Hodnocené. / 5. Na základě hodnocení zákazníků
Zobrazit stránku 74
E
Backup Links (HP 28688B and HP 28699A
Only)
Description
In some network configurations a critical link exists, for example between two workgroups
that regularly share or exchange data over the network. To maintain the integrity of such
a critical link, the HP EtherTwist Hub Plus and Hub Plus/48 offer a backup link feature.
A backup link is a separate cable run between two hubs that is automatically enabled if
the connection designated as the primary link fails.
The hub on which the redundant link is configured (hub A in the illustration), is
responsible for monitoring the link. It sends IEEE 802.2 Test packets to the remote hub
(hub B in the illustration) and looks for response packets from that hub. If the response
packets fail to come back, the primary link is considered as having failed and the backup
link, which had not been carrying any traffic, is enabled automatically. If the primary link
does fail, it is automatically disabled until it can be repaired and reenabled.
When the primary link is repaired, you must reenable the primary port. It is not
reenabled automatically. When the primary port is enabled, the backup port is
automatically disabled and returned to backup mode. See “Reactivating the Primary
Link” later in this appendix.
“primary” link
“backup” link
(normally inactive)
hub A
“monitoring
hub”
hub B
“remote hub”
802.2 test packets
802.2 response packets
Backup Links E-1
Zobrazit stránku 74
1 2 ... 70 71 72 73 74 75 76 77 78 79 80 ... 101 102

Komentáře k této Příručce

Žádné komentáře